,76 
Arizona, lead carbonate, 77 per cent, of lead; and Anglesite^ Sar- 
dinia, lead sulphate, 68 per cent, of lead. 
Cases IG and. 17. — Lead ores from New Mexico and 
Mexico. 
Case 18. — Lead ores from England, Australia, Spain and 
Greece. 
Case 20. — Lead ores from Germany. Some of the specimens 
here are especially instructive as showing the characteristic struc- 
ture of veins. The different minerals are arranged in bands or 
layers, the metalliferous layers alternating with those of quartz, 
barite or fluor spar. 
Case H. — Different concentrates in the process of lead ex- 
traction. 
Case I. — Collections showing the ore products of two Lead- 
ville, Colorado, mines. Though worked primarily for lead, by 
careful treatment, gold, copper, zinc and manganese are obtained 
from the ore. 
Case eJ. — Uses of lead. Alloys of lead with other metals, 
sheet lead, shot, red lead, white lead. 
The visitor should now pass to the eastern end of the hall and 
note the following special groups in the center. 
K. — Silver, lead and copper ore. Cordillera Hill silver mine, 
Peelwood, New South Wales. 
Li. — Gold and silver ore, British Columbia. 
M. — Gold and silver ore from the State of Washington and 
other American localities. 
N. — Zinc-lead ore, Laurium, Greece. 
O. — Copper-silver ore. Leadville, Colorado. Assays silver, 
41 oz. per ton; copper, 18 per cent. 
P. — Silver-lead ores. Barrier Range, New South Wales 
Assays silver, 58 oz. per ton; lead, 72 per cent. 
Q. — Copper-silver ore. Ouray County, Colorado. Assays 
copper, 28 per cent.; silver, 42 oz. per ton. 
K. — Auriferous quartz. San Miguel County, Colorado 
Assays average $6 to $8 gold per ton. 
S. — Silver and gold ore from the State of Washington, and 
other specimens from American localities. 
T, — Block of ore from 40 foot level of the Back Creek Silver 
